They should have had a new chief buyer at the Store about Pam's age, brunette and good looking, casually befriend Cliff and Bobby and gradually start dropping bits of knowledge only Pam could have known. Things like the riddle she told Bobby when she was first pregnant, that Cliff was sitting on the floor outside her apartment when she went back to get some clothes the day she moved to Southfork, and the fact that Bobby was shirtless when he told her he didn't like that she might still be married to Ed Haynes.
Eventually, one morning as the Ewings ate breakfast, this woman, who we viewers knew as "Wendy Farmalee", would burst up from within the Southfork swimming pool where she'd been hiding underwater with a small scuba tank, casually grab a towel and stride up to the patio table and announce she's really Pam.
She'd subsequently pass a lie detector test and provide irrefutable medical proof (verified by Dr. Danvers) that she'd had miscarriages caused by a fall from a hayloft and a fall from a horse spooked by a rattlesnake.
Just as people were starting to believe she was Pam, Wendy would tell Bobby offscreen that she had befriended Pam at a fashion show in Paris and heard Pam tell her life story in detail at the afterparty after indulging in too much of the cocaine that was so rampant in the fashion world of the late 70s. Their identical miscarriages and their very specific circumstances were mere coincidence.
Wendy would then steal a Southfork helicopter and take off, never to be seen again, although it would later be rumored she'd become the chief buyer at the Store in Houston. The episode would end with a tearful Bobby silently gazing at a semi-lewd photo of himself and Pam frolicking inside her black Corvette from around the time when Ray was dating Garnet McGee. He'd subsequently start taking frequent, inexplicable "business trips" to Houston. Wendy was Pam after all.
